本文關鍵詞： 褐煤 干燥 氣爆 成型率 落下強度　出處：《遼寧科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著世界優(yōu)質煤炭資源的逐漸減少,開采費用日益增高,世界各國開始或更加重視對儲量豐富的褐煤資源的開發(fā)利用,但由于褐煤水分含量高,含氧量高,發(fā)熱量低,易風化和自燃,不利于長途運輸?shù)仍?其應用范圍受到一定的限制。只有通過對其進行提質加工,才能擴大褐煤用途,提高其經(jīng)濟價值。本論文以神華寶礦褐煤為研究對象,對其進行干燥脫水和熱壓成型,運用成型工藝參數(shù)、成型機抽氣系統(tǒng)對成型氣爆的影響和防止成型機的氣爆的工藝著手探討神華寶日希勒褐煤提質工業(yè)試驗裝置運行中存在的制約系統(tǒng)穩(wěn)定運行的成型機氣爆、提質煤成型率、型煤落下強度等重要問題。研究結論如下:成型輥間布料均勻性、提質煤溫度,水分、給料粒度分布等是造成氣爆的主要原因。通過運行總結當成型機加載壓力相差大于30Bar時,氣爆明顯,提質煤溫度控制在85~95℃、水分在8%~10%之間,成型機的氣爆問題能夠得到有效控制。提質煤的溫度、水分、成型機加載壓力等是影響提質煤成型率的主要原因。通過運行總結,提質煤溫度控制在85~95℃、水分在8%~10%之間、加載壓力在17Mpa時,提質煤成型最佳。型煤落下強度的影響因素有:提質煤溫度、水分和粒徑分布,成型機輥縫間隙和加載壓力、成型機氣爆問題等。
[Abstract]:With the decrease of high quality coal resources in the world and the increasing of mining cost, many countries in the world begin or pay more attention to the exploitation and utilization of lignite resources, which are rich in reserves. However, because of the high moisture content, high oxygen content and low calorific value of lignite, Weathering and spontaneous combustion are not good for long-distance transportation, and its application scope is limited. Only by improving the quality of lignite, can the use of lignite be expanded and its economic value be improved. In this paper, the lignite of Shenhua Mine is taken as the research object. Drying, dehydration and hot pressing were carried out, and the forming process parameters were used. The influence of the air extraction system of the moulding machine on the forming gas explosion and the process of preventing the gas explosion of the moulding machine are discussed in the operation of the Shenhua Baolishler lignite extraction industrial test unit, which restricts the stable operation of the system and the molding rate of the molding machine. The main reasons for the gas explosion are as follows: the distribution uniformity between the forming rollers, the temperature of the raised coal, the moisture content, the distribution of the grain size of the feedstock, etc. The main reasons for the gas explosion are summarized through the operation, when the load pressure difference of the molding machine is greater than 30Bar, The gas explosion is obvious, the temperature of the coal is controlled at 85 ~ 95 鈩，

本文編號：1551616